Math
posted by Jayson .
help with these questions~
Thank you
1. Determine the interval(s) on which x^2 + 2x 3>0
a)x<3, x>1
b)3<x<1
c)x<3, 3<x<1, x>1
d) x>1
Answer is D, x>1

2. Determine when the function f(x)= 3x^3 + 4x^2 59x 13 is greater than 7.
a) 5<x<1/3
b) 5<x<1/3, x>4
c) x<4
d) x=5, 1/3,4
Answer is: B

3. Provde the intervals you would check to determine when 5x^2 + 37x> 15x^2 + 12x + 15.
a) x=3, x=0.5
b) x<3, 3<x<0.5, x>0.5
c) x<1, 1<x<15, x>15
d) x= 1, x=15

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